Research Review on the Improvement of Low-medium Yielding Farmlands in China

中低产田土改造作为作为一项促进农业发展的基础工程，它在改善中国农业生产基本条件、提高农业综合生产能力、增加主要农产品的有效供给和增加农民收入等方面发挥了重要作用。中低产田土改造也是一项综合的系统工程，涉及农学、工程学、水文学、土壤学、经济学、生态学等诸多学科。中国在中低产田土改造方面长期以来进行了卓有成效的研究，并取得了丰富的成果。在此，在前人工作的基础上，主要对中低产田土改造的概念、类型划分、形成原因和改造技术研究现状作了简要综述，讨论了当前研究存在的问题及今后的发展趋势。

Research Review on the Improvement of Low-medium Yielding Farmlands in China

The improvement of low-medium yielding farmlands is a basic engineering to promote the development of agriculture. It has important pole on meliorating the agriculture foundation condition, promoting agricultural comprehensive productive ability, increasing the effective supply of major agricultural products and fanners' and income, etc. This improvement is also a comprehensive system engineering, which involves agronomy, engineering, hydrology, pedology, economics, ecology, etc. There have abundant research results on improving low-medium yielding farmland. Based on a lot of previous work, the paper main introduces the concepts, type, cause and technology on low-medium yielding farmland, and discusses the existing problems of current works and future research direction.